This page lists 53 electrical bulb & socket parts for the 2021 Chevrolet Trailblazer, across 7 part types, covering both the 1.2L L3 Turbocharged and the 1.3L L3 Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 Chevrolet Trailblazer, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. Most of the listed parts are Headlamp Bulb (17 parts), Brake Light Bulb (9 parts) and Tail Lamp Bulb (9 parts). The other 4 part types cover the remaining 18 parts.
The 2021 Chevrolet Trailblazer was sold with both the 1.2L L3 Turbocharged and the 1.3L L3 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Chevrolet Trailblazer electrical bulb & socket parts are SYLVANIA (22 parts), WAGNER (19 parts) and GM GENUINE (10 parts), plus 1 more brand. Quality grades include Standard Replacement, Extended Life and Extra Bright.
12 parts on this 2021 Chevrolet Trailblazer page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including SYLVANIA 921LL (Back Up / Reverse Lamp Bulb) and SYLVANIA 7440LL (Brake Light Bulb). Click any part number to see every vehicle that part fits.
Back Up / Reverse Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 1.3L L3 Turbocharged | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.2d | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 921LL | 🇺🇸 US 🇨🇦 CA | Long LifeWedge Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Fits: 1.3L L3 Turbocharged | 921ST | 🇺🇸 US 🇨🇦 CA | Cool WhiteSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 1.3L L3 Turbocharged | 921WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 1.3L L3 Turbocharged | 921 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-5 Bulb 5/8 (16mm) DiameterVoltage: 12.800 Volts (Direct Current) | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13503360 | 🇺🇸 US 🇨🇦 CA | TRADE # W16WCLEAR | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 921 | 🇺🇸 US 🇨🇦 CA | Base Type: W2.1x9.2dWattage: 18.00 W | View on Amazon |
This table covers the bulbs in the reverse lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
7 Back Up / Reverse Lamp Bulb parts are listed for the 2021 Chevrolet Trailblazer, from SYLVANIA, WAGNER and GM GENUINE. SYLVANIA 921LL carries the "Popular" badge.
The Extended Life section lists 2 options from SYLVANIA and WAGNER — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. SYLVANIA 921LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section lists 1 option from SYLVANIA — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. SYLVANIA 921ST is listed in this group.
In the LED (instant-on, long life, energy-saving) grade, WAGNER supplies 1 part: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is WAGNER 921WLED.
The Standard Replacement section lists 3 options from WAGNER, GM GENUINE and SYLVANIA — built to original-equipment specification. WAGNER 921 is listed in this group.
Listed part numbers: SYLVANIA 921LL and SYLVANIA 921ST, plus the other parts above.
Brake Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 1.3L L3 Turbocharged | 7440LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W3X16D | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 7440LL | 🇺🇸 US 🇨🇦 CA | Long LifeSingle Contact Wedge Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Fits: 1.3L L3 Turbocharged | 7440ST | 🇺🇸 US 🇨🇦 CA | Cool WhiteSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Fits: 1.3L L3 Turbocharged | 7440RLED | 🇺🇸 US 🇨🇦 CA | Ultinon LEDRed | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 7440RSL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 7440SL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 1.3L L3 Turbocharged | 7440 | 🇺🇸 US 🇨🇦 CA | Single Contact Wedge Base21.000 Watt | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13596816 | 🇺🇸 US 🇨🇦 CA | Wattage: 21 | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 7440 | 🇺🇸 US 🇨🇦 CA | Base Type: W3X16DWattage: 25.00 W | View on Amazon |
This table covers the bulbs in the stop lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
9 Brake Light Bulb parts are listed for the 2021 Chevrolet Trailblazer, from SYLVANIA, WAGNER, PHILIPS and 1 other brand. SYLVANIA 7440LL carries the "Popular" badge.
The Extended Life section: 2 options from SYLVANIA and WAGNER. SYLVANIA 7440LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section: 1 option from SYLVANIA. SYLVANIA 7440ST is listed in this group.
LED (instant-on, long life, energy-saving): 3 parts, from SYLVANIA and PHILIPS. A representative part number is PHILIPS 7440RLED.
The Standard Replacement section: 3 options from WAGNER, GM GENUINE and SYLVANIA. WAGNER 7440 is listed in this group.
Listed part numbers: SYLVANIA 7440LL and SYLVANIA 7440ST, plus the other parts above.
Headlamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Fits: 1.3L L3 Turbocharged | 9005LL | 🇺🇸 US 🇨🇦 CA | Long Life | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 1.3L L3 Turbocharged | 9005SU | 🇺🇸 US 🇨🇦 CA | Silver Star UltraColor Temperature: 4100 KV | View on Amazon |
| WAGNER Popular Fits: 1.3L L3 Turbocharged | 9005BLX | 🇺🇸 US 🇨🇦 CA | Long Life80% More Light | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 9005XV | 🇺🇸 US 🇨🇦 CA | Xtra VisionColor Temperature: 3200 KV | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 9005ST | 🇺🇸 US 🇨🇦 CA | Silver StarColor Temperature: 4000 KV | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | H9ST | 🇺🇸 US 🇨🇦 CA | Silver StarColor Temperature: 4000 KV | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 9005SZG | 🇺🇸 US 🇨🇦 CA | Silver Star zXe GOLDColor Temperature: 4200 KV | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 9005TVX | 🇺🇸 US 🇨🇦 CA | HID Look | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Fits: 1.3L L3 Turbocharged | 9005SL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 1.3L L3 Turbocharged | 9005 | 🇺🇸 US 🇨🇦 CA | Base Type: P20D | View on Amazon |
| WAGNER Popular Fits: 1.3L L3 Turbocharged | 9005 | 🇺🇸 US 🇨🇦 CA | Voltage: 12.800 Volts (Direct Current) | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13589425 | 🇺🇸 US 🇨🇦 CA | Low BeamTrade 9005 SL+ | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 84624411 | 🇺🇸 US 🇨🇦 CA | High BeamTRADE # H9 | View on Amazon |
| PHILIPS Fits: 1.3L L3 Turbocharged | H9 | 🇺🇸 US 🇨🇦 CA | High Beam | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | H9 | 🇺🇸 US 🇨🇦 CA | High Beam | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 9005L | 🇺🇸 US 🇨🇦 CA | Long Life | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 1265H9 | 🇺🇸 US 🇨🇦 CA | High BeamHalogen | View on Amazon |
This table covers the bulbs that light the headlamps. Typical signs include a dark lamp, a flicker over bumps, or a bulb that keeps failing on one side. Avoid touching a halogen capsule. Repeated failure in one socket is usually the socket or ground, not the bulb.
17 Headlamp Bulb parts for the 2021 Chevrolet Trailblazer come from 4 brands — SYLVANIA, WAGNER, GM GENUINE and 1 other brand. The "Popular" part is SYLVANIA 9005SU.
Extended Life: 1 part, from SYLVANIA. A representative part number is SYLVANIA 9005LL.
Extra Bright (improved visibility, but shorter life): 7 parts, from SYLVANIA and WAGNER. A representative part number is SYLVANIA 9005SU.
The LED (instant-on, long life, energy-saving) section: 1 option from SYLVANIA. SYLVANIA 9005SL is listed in this group.
Standard Replacement: 8 parts, from WAGNER, SYLVANIA, GM GENUINE and 1 other brand. A representative part number is SYLVANIA 9005.
LED Bulb Adapter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 1.3L L3 Turbocharged | CB900590069012 | 🇺🇸 US 🇨🇦 CA | LEDFor 9005 / 9006 / 9012 Bulb | View on Amazon |
This table covers the LED Bulb adapters.
This group shows a single part: WAGNER CB900590069012.
Step / Courtesy Light Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13503363 | 🇺🇸 US 🇨🇦 CA | CenterP-Nut Size | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13500832 | 🇺🇸 US 🇨🇦 CA | Fits RearCLEAR | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 42863317 | 🇺🇸 US 🇨🇦 CA | Rear CenterLS Model or LT Model | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 86538592 | 🇺🇸 US 🇨🇦 CA | Rear CenterACTIV or RS Model | View on Amazon |
This table covers the bulbs in the step and courtesy lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
GM GENUINE supplies the 4 Step / Courtesy Light Bulb parts for the 2021 Chevrolet Trailblazer.
Part numbers include GM GENUINE 13503363, GM GENUINE 13500832 and GM GENUINE 42863317, among others listed above.
Tail Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 1.3L L3 Turbocharged | 2825LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: W2.1x9.5d | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 168LL | 🇺🇸 US 🇨🇦 CA | Long LifeWedge Base | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 7440LL | 🇺🇸 US 🇨🇦 CA | Long LifeSingle Contact Wedge Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Fits: 1.3L L3 Turbocharged | 2825ST | 🇺🇸 US 🇨🇦 CA | BlueSilver Star | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 1.3L L3 Turbocharged | 7440WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 1.3L L3 Turbocharged | 168 | 🇺🇸 US 🇨🇦 CA | Wedge Base4.900 Watt | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13500812 | 🇺🇸 US 🇨🇦 CA | LS Model or LT ModelTRADE # W5WLL | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 2825 | 🇺🇸 US 🇨🇦 CA | Base Type: W2.1x9.5dWattage: 5.00 W | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 7440 | 🇺🇸 US 🇨🇦 CA | Single Contact Wedge Base21.000 Watt | View on Amazon |
This table covers the bulbs in the tail lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
9 Tail Lamp Bulb parts for the 2021 Chevrolet Trailblazer come from 3 brands — WAGNER, SYLVANIA and GM GENUINE. The "Popular" part is SYLVANIA 2825LL.
Extended Life: 3 parts, from WAGNER and SYLVANIA. A representative part number is SYLVANIA 2825LL.
Extra Bright (improved visibility, but shorter life): 1 part, from SYLVANIA. A representative part number is SYLVANIA 2825ST.
The LED (instant-on, long life, energy-saving) section: 1 option from WAGNER. WAGNER 7440WLED is listed in this group.
Standard Replacement: 4 parts, from WAGNER, GM GENUINE and SYLVANIA. A representative part number is WAGNER 168.
Part numbers include SYLVANIA 2825LL, WAGNER 168LL and WAGNER 7440LL, among others listed above.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular Fits: 1.3L L3 Turbocharged | 7440ALL | 🇺🇸 US 🇨🇦 CA | AmberBase Type: W3X16D | View on Amazon |
| WAGNER Fits: 1.3L L3 Turbocharged | 7440LL | 🇺🇸 US 🇨🇦 CA | Long LifeSingle Contact Wedge Base | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Fits: 1.3L L3 Turbocharged | 7440WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular Fits: 1.3L L3 Turbocharged | 7440 | 🇺🇸 US 🇨🇦 CA | Single Contact Wedge Base21.000 Watt | View on Amazon |
| GM GENUINE Fits: 1.3L L3 Turbocharged | 13596817 | 🇺🇸 US 🇨🇦 CA | WY21W BULBAMBER | View on Amazon |
| SYLVANIA Fits: 1.3L L3 Turbocharged | 7440A | 🇺🇸 US 🇨🇦 CA | Amber | View on Amazon |
This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
6 Turn Signal Lamp Bulb parts are listed for the 2021 Chevrolet Trailblazer, from WAGNER, SYLVANIA and GM GENUINE. SYLVANIA 7440ALL carries the "Popular" badge.
The Extended Life section: 2 options from SYLVANIA and WAGNER. SYLVANIA 7440ALL is listed in this group.
LED (instant-on, long life, energy-saving): 1 part, from WAGNER. A representative part number is WAGNER 7440WLED.
The Standard Replacement section: 3 options from WAGNER, GM GENUINE and SYLVANIA. WAGNER 7440 is listed in this group.
This group includes SYLVANIA 7440ALL, WAGNER 7440LL and WAGNER 7440WLED and the remaining parts above.
Buying Electrical Bulb & Socket Parts for a 2021 Chevrolet Trailblazer
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- Match the engine first. Every electrical bulb & socket part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Headlamp Bulb and Brake Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 2021 Chevrolet Trailblazer?
Our catalog currently lists 53 electrical bulb & socket parts for the 2021 Chevrolet Trailblazer across 7 subcategories and 4 brands, covering both the 1.2L L3 Turbocharged and the 1.3L L3 Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical bulb & socket parts differ between 2021 Chevrolet Trailblazer engines?
Yes. Every electrical bulb & socket part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical bulb & socket problems on a 2021 Chevrolet Trailblazer?
Common symptoms include a lamp that flickers over bumps, melted or discolored socket plastic, or bulbs that keep failing early on one side. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Chevrolet Trailblazer was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Chevrolet Trailblazer?
First match the engine — each row shows which engine(s) the part fits. Then repeated bulb failure in one position usually means a socket or ground problem, not bad bulbs — replace the socket rather than chase it. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Chevrolet Trailblazer
Electrical Bulb & Socket Parts for Other Chevrolet Trailblazer Years
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